Critique my layout?

So, I've been playing around with plotting my sprinkler system heads and zones. I was thinking about using Hunter I-20's with precipitation matched nozzles for the large areas and haven't decided what I should use for the lower section of the diagram. I have about a 12ft section between the house and the property line. I have thick skin so feel free to tear apart my design. I tried dividing the property into rectangular sections but I have trouble "joining" the sections together to get even coverage. I only have 7.25GPM @ 59psi coming out of my outdoor spigot which is kind of worrisome. It does go from 1" PEX to a peice of 6 foot 1/2" PEX before it reaches the spigot. Maybe that explains my low GPM. I'm hoping I can get at least 4 heads on each zone with a 1" main line.

I don't normally answer design questions. I would like to suggest you put a sprinkler at the top left corner of this drawing, the jpg3. Also in the section at the bottom right of jpg3. The top right corner of that section I'd start there with my layout and work left so there's a sprinkler in the corner. The way you have it you'll be spraying the street trying to keep that corner watered.